The number of people on this planet with the singular knowledge to build a modern processor, from scratch, I would estimate is well under 1,000. The number with the knowledge and the resources to do so is even lower.
Telling someone if they don't like their processor choices to "build their own" is like telling someone to build their own ISP/Telco service if they're not happy with the sole Comcast offering in their area.
> The number of people on this planet with the singular knowledge to build a modern processor, from scratch, I would estimate is well under 1,000
I am pretty sure that most EE/CE students at some point or another implement a basic processor on a fpga. That being said, I am not sure how many of them would be able to build a "modern" one.
Yeah the number people who can, by themselves or with a small team, build a modern processor that's half as fast or half as efficient as something AMD put out 10 years ago is so small it's actually probably a negative number. Fabs are really, really, really really really expensive and processors are really hard to design.